Lasonolide A: Structural Revision and Total Synthesis
摘要:
The proposed structure of lasonolide A was synthesized employing radical cyclization reactions of beta-alkoxyacrylates for preparation of the tetrahydropyranyl units A and B, but the spectroscopic data did not match those of the natural product. Both enantiomers of a revised structure featuring 17E,25Z double bonds were synthesized, and the (-)-isomer was found to be the biologically active enantiomer.
Lasonolide A: Structural Revision and Synthesis of the Unnatural (−)-Enantiomer
摘要:
Total synthesis of the unnatural (-)-enantiomer of lasonolide A was achieved starting from ethyl l-malate. The two tetrahydropyranyl fragments were prepared stereoselectively via radical cyclization reactions of beta-alkoxyacrylates. The full structure of natural lasonolide A was determined unequivocally.